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Equity - Restricted stock units (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 9 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
Other disclosures |  |  |  |  |  |  |  |
Share-based payments subject to redemption | $ 32 | $ 27 | $ 23 | $ 31 | $ 28 | $ 25 | $ 21 | $ 37
Restricted stock units (RSUs) |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Vesting terms | 3 years |  |  |  |  |  |  |
Service period over which compensation expense would be amortized | 1 year |  |  |  |  |  |  |
Restricted stock unit activity |  |  |  |  |  |  |  |
Non-vested at the beginning of the period (in shares) | 339 |  |  |  |  |  |  |
Granted (in shares) | 178 |  |  |  |  |  |  |
Vested (in shares) | (92) |  |  |  |  |  |  |
Cancelled (in shares) | (14) |  |  |  |  |  |  |
Non-vested at the end of the period (in shares) | 411 |  |  |  |  |  |  |
Weighted-average fair value per share |  |  |  |  |  |  |  |
Non-vested at the beginning of the period (in dollars per share) | $ 108.02 |  |  |  |  |  |  |
Granted (in dollars per share) | 88.10 |  |  |  |  |  |  |
Vested (in dollars per share) | 117.18 |  |  |  |  |  |  |
Cancelled (in dollars per share) | 102.71 |  |  |  |  |  |  |
Non-vested at the end of the period (in dollars per share) | $ 97.52 |  |  |  |  |  |  |
Other disclosures |  |  |  |  |  |  |  |
Unrecognized compensation cost | $ 18 |  |  |  |  |  |  |
Weighted-average period for amortization of unrecognized compensation cost | 1 year 9 months 18 days |  |  |  |  |  |  |

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer. + References No definition available. + Details
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